Sinker heads of rectilinear knitting machines



Feb. 18, 1958 J. L. R. BOGEY 2,823,532

SINKER HEADS OF RECTILINEAR KNITTING MACHINES Filed March 12, 1957 Mrs/mk- /EA V A. 3y

United States Patent SINKER HEADS OF RECTILINEAR KNITTING MACHINES Jean Louis Robert Bogey, Neuilly-sur-Seine, France Application March 12, 1957, Serial N 0. 645,468

Claims priority, application France July 26, 1956 3 Claims. (Cl. 66110) In modern rectilinear knitting machines, the upper edge of the dividers and sinkers, instead of being straight, is formed with a recess adjacent its front end. This recess is intended to provide for the free passage of the yarn carrier tube, but since this improvement has been adopted, there has been observed a very rapid wear in depth of the upper bottom and lower bottom of the slots formed in the top and bottom of the sinker head, in which the dividers and sinkers slide. In particular, the wear of the upper bottom of said slots is caused directly by the corner or corners formed on the upper edge of the divider or sinker at the end or ends of the aforesaid recess, whereas the wear of the lower bottom of said slots is the consequence of a tilting of the divider or sinker which occurs at each stroke thereof, because of the wear of the upper bottom of said slots.

The present invention has for its object to avoid this drawback.

According to the invention, every sinker head slot bottom against which a recessed edge of a divider or sinker slides is formed with a cavity whose position and length are such that the corner or corners formed by the recess on said edge remain out of contact with the unexcavated portion of said bottom, throughout the stroke between the extreme positions assumed by said divider or sinker during its reciprocal movement.

Thus, the aforesaid corners can no more scrape against the sinker head slot bottom along which the un recessed portion of the recessed divider or sinker edge slides, so that the above-mentioned drawback is done away with.

The appended drawing illustrates by way of example an embodiment of the invention.

Fig. l is a cross section of a sinker head, taken on the median plane of a slot containing a divider (line I-I of Fig. 2), the divider being at the end of its rearward stroke.

Fig. 1a is another cross section of the same sinker head, taken on the median line of a slot containing a sinker (line IaIa of Fig. 2), the sinker being at the end of its rearward stroke.

'Fig. 2 is a partial longitudinal section of the sinker head, taken on line II--II of Figs. 1 and la.

0n the drawing, S is the bottom of the sinker head, R is the top of the latter and D are the slots in which the stitch forming elements P and T slide. The stitch forming elements placed in the subsequent slots of the sinker head are alternately dividers P and sinkers T. The thickness of the dividers and sinkers and the clearance between them and the walls of the slots D have been "ice greatly exaggerated on the drawing, for the sake of clearness.

The upper edge P of the divider P (Fig. 1) is formed with a recess E which extends to the front end of said edge and thus forms with the latter only one corner A, at the rear end of said recess. According to the invention, the upper bottom D of the slot in which the divider slides is formed with a cavity 1 which is such that the corner A never touches the unexcavated portion of said upper bottom D To this effect, the rear end in of said cavity 1 is located behind the position assumed by the corner A at the end of the rearward stroke of the divider P (as shown on Fig. 1).

In the case of a sinker T (Fig. 1a), the recess E formed in the upper edge T thereof does not extend as far as the front end of said edge, so that two corners A and A" are formed. The rear end 1a of the cavity 1 being again located behind the position assumed by the rearmost corner A at the end of the rearward stroke of the sinker T, none of the corners A and A" ever comes into contact with the unexcavated portion of the upper slot bottom D It will be understood that the invention is not limited to the embodiment which has been described and shown, but can be applied generally in connection with recesses formed at any place of the divider and sinker edges and irrespective of the function of these recesses.

I claim:

1. In a rectilinear knitting machine, a sinker head formed with a slot having a bottom, a stitch forming element engaged for reciprocal movement in said slot and having an edge slidingly engaging said bottom, said stitch forming element having a recess formed in said edge and forming at least one corner with the unrecessed portion of said edge, and said bottom being formed with a cavity whose position and extension are such that said corner remains out of contact with the unexcavated portion of said bottom, throughout the stroke between the extreme positions assumed by said stitch forming element during its reciprocal movement.

2. In a rectilinear knitting machine, a sinker head formed with a slot having a bottom, a divider engaged for reciprocal movement in said slot and having an edge slidingly engaging said bottom, said divider having a recess formed at the front end of said edge and forming a corner with the unrecessed portion of said edge, and said bottom being formed with a cavity whose position and extension are such that said corner remains out of contact with the unexcavated portion of said bottom,

throughout the stroke between the extreme positions assumed by said divider during its reciprocal movement.

3. In a rectilinear knitting machine, a sinker head formed with a slot having a bottom, a sinker engaged for reciprocal movement in said slot and having an edge slidingly engaging said bottom, said sinker having a recess formed in said edge and forming two corners with the unrecessed portions of said edge, and said bottom being formed with a cavity whose position and extension are such that said corners remain out of contact with the unexcavated portion of said bottom, throughout the stroke between the extreme positions assumed by said sinker during its reciprocal movement.

(No references cited.) 

